In order to give numerical results of unpolarized and linearly polarized WW gluon distributions in coordinate space, according to Eq. (REF ) and Eq. (REF ), gluon saturation scale \(Q^2_{sg}\)  should be known, this value can be obtained by solving the rcBK equation. To avoid repetition, details can be found in Refs. [1]}, [2]}. We stress that the key input of rcBK equation is the initial saturation scale \(Q^2_{s0}\) , in what follows, we choose \(Q^2_{s0}=0.2\ \mathrm {GeV}^2\)  for proton.
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